Designed for long-term storage and easy sample retrieval. Indexed rack and box system allows you to find the sample needed quickly and efficiently. Compact size stores up to 3600 samples. A unique hanging rack and gridded box design allows tracking and easy retrieval of samples. The Locator Jr. uses 9-by-9 box arrays to store 2.0 ml vials. The Locator Jr. can be optionally equipped with 4" boxes that accommodate 5 ml vials in 9-by-9 arrays. The Thermolyne advanced vacuum system minimizes liquid nitrogen evaporation, and advanced insulation assures all samples are stored below -180ï¿½C even when less than 2" (5 cm) of liquid nitrogen remains in the vessel.